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Flowchart of the number of participants in the study. *Only a single dose of the AstraZeneca, Pfizer or Moderna vaccine was administered to patients, possibly due to the protocol in the Netherlands for patients with previous COVID-19 infection [13] or the decision to not receive a second dose. #Active participants had not received a second dose at the time of data extraction but were still eligible to receive a second vaccine and continue in the study
